Improvement in spoke-lathes



UNITED STATES PATENT OFFICE.

JOHN PLUMMER, OF LONDON, CANADA.

IMPROVEMENT IN SPOKE-LATHES.

Specification forming part of Letters Patent N0- 157,696, dated December15, 1874; application filed October 15, 1874.

To all whom it may concern:

Be it known that I, JoHN PLUMMER, of the city of London, in the countyof Middlesex, Province of Ontario, Canada, have invented Improvements inSpoke-Lathes using three centers, of which the following is aspecification The object of this invention is to prevent vibration inthe spoke during the process of dressing by a lathe, the result of suchvibration being that the spoke is turned out in a rough and unfinishedmanner.

My improvement insures its being held perfectly steadily during theoperation, thus allowing equal action to the knives of the machine, sothat the spoke is turned out perfect, and finished ready for use.

A, in the accompanying drawing, is a portion of the reel of aspoke'lathe, having three centers, B B B, for holding the spokes whilein the process of dressing by the knives 0. Two of these spokes areshown at D E; the lower one, E, is shown in position for dressing. Inorder to prevent the vibration of this spoke, and insure perfectsteadiness thereof, I attach to-the shaft F of the reel a triangularshaped block, G, of cast-iron or other metal, having three slots in itssides, into which are hinged the stems of three weights, H H H formed ofcast-iron or other suitable material. Of these three weights, two willalways be lying against the shaft F, as shown, out of the way of theworkman; but the lower one will necessarily fall down upon the spokewhich is undergoing the operation of dressing, and, pressing upon thesaid spoke near the center, render it perfectly steady and secure. Theseweights may be constructed of any required shape, either round, asshown, or square, as may be thought fit. A set-screw in the side of theblock G renders it capable of adjustment on the shaft A to any requiredlength of spoke.

I claim as my invention The triangular metal block G, having the threemetal weights H H H hinged thereto, in combination with the reel Aof athreecenter spoke-lathe, substantially as shown, and for the purpose setforth.

JOHN PLUMMER. Witnesses:

HENRY BEECH, EDWARD HARRIS.

